You don't need to link your account. Xamarin for Visual Studio will validate against your Visual Studio subscription. There's also no need to sign into your Xamarin account within Visual Studio unless you intend to use the Components Store.

That said, Xamarin Studio on your Mac will show as Community unless you redeem your Xamarin benefit through your Visual Studio subscription page here:

Alan, can you please give precise steps on how to link my MSDN Visual Studio Enterprise license to Xamarin? I switched to the Community edition because I cannot find how to link the accounts together. This should be better explained IMHO.

I tried following the recommended steps but my VS enterprise didn't appear correctly in the Xamarin portal, it took some tweaking on the backend by our CSR to make it make the licences appear correctly. It should read "Visual Studio Enterprise" in your account dashboard. It might be less grief contacting Xamarin to sort it out as the process didn't work for us.

The process didn't work for us when activating the licence for Xamarin Studio on the Mac, also the licences didn't change in the Xamarin portal. It had to be sorted in the backend, this was for transferring from Ultimate to MLS.

@AlanClark I have an MSDN subscription through the Microsoft MVP program (Enterprise). When I log in, it asks me to go to my.visualstudio.com. Then I try to activate the Xamarin subscription. It says "MSDN benefit cannot be redeemed because your organization has multiple Xamarin licenses in use. Please contact hello@xamarin.com to have your licenses transferred." I'll contact them and see if they can sort it out.

@AlanClark I have an MSDN subscription (Professional). When I log in, to my Xamarin Account, my subscribtion is expired. Then I tryed to activate the Xamarin subscription on https://my.visualstudio.com/benefits. It says "MSDN benefit cannot be redeemed because your organization has multiple Xamarin licenses in use. Please contact hello@xamarin.com to have your licenses transferred."